I think it's part of an evolution. Some web-designers are discovering the (long established in traditional printing) grid systems but not all of them really know how to use it or really what to do with it, besides the fact that it's a tool that they should probably use. They end up using it more prominently than they should because it's new to them.

To me, it feels like it's the result of learning the domain backwards, where you have a finished product and then learn about how it's usually done, so you correct here and there some aspects. And it shows.

To be honest, I'm saying that without knowing either how to properly use grids. As many others, I have seen many descriptions of it and how, for some designers, it's the ultimate thing and for others, a tool that they don't want to stick to (e.g. as presented in the documentary Helvetica.)

In the end, do you feel that it's better or worse that people with no "proper" design background apply the grid systems "too much" rather than not paying attention to it at all? I believe that it's good that that kind of knowledge gets spread out, even it misused at first.